I'm also running Door of Destinies, Obelisk of Urd, and Coat of Arms, though that last artifact can really backfire when played against another deck that is focused on a single creature type
Its base cost is three mana (three green) plus an additional X, where X represents the amount of mana the controller pays
My decision to play 16 lands was a bit of a no brainer, though I mightve played 17 lands with Access Tunnel as a bit of a compromise as the 17th land with a higher curve
Leonardo also boosts all your thopters, so cards like Whirler Rogue or Sai, Master Thopterist play nicely with the old Italian inventor around
A three mana instant 2 for 1 is a good card, Esper Charm was played a lot in that capacity
We started off going way back to Ancestral Recall, one of the busted best blue mtg cards draw spells of all time